Speed-changing device for automatic lathes.



no. 681,189. Patented Aug. 27, 190i".

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SPEED CHANGING DEV-ICE FOB AUTOMATIC LATHES.

(Application filed Oct. 11, 1900.)

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(Application filed Oct. 11, 1900.)

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JOHN P. BROPHY, OF CLEVELAND, OHIO, ASSIGNOR TO THE CLEVELAND MACHINE SCREW COMPANY, OF SAME PLACE.

SPEED-CHANGING DEVICE FOR AUTOMATIC LATHES.

\ $PEGIFICATION forming part Of Letters Patent No. 681,189, dated August 27, 1901.

Application filed October 11, 1900. Serial No. 82,691- (No model.)

i To all whom itmay concern:

, Be it known that 1, JOHN -P. BROPHY, a citi-- zen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of 1 5 Ohio, have invented anew and useful Iniprovement in Speed-Changing Devices for Automatic Lathes, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions. r

. My invention relates to automatic lathes, and particularly to devices for changing the I speed and direction of rotation of -the livespindle, whereby the speed of the work and the direction of rotation thereofmay be changed to conform with the nature of the operation being performed thereon. The annexed drawings andthe following description set forth in detail certain means embodying. the invention, such disclosed means constituting but one ofvarious forms inwhich the principle of the invention may be used.

. In said annexed drawings, Figure I reprel sents a top plan view of the head-stock and adjacent parts of an automatic lathe embodying my invention. Fig. II represents an enlarged detail plan view with part of the adjacent mechanism shown in Fig. I omitted and a part of the invention illustrated in horizontal cross-section. i

Ahollow driving-spindle A is mounted upon a rodB, suitably supported in brackets 0, secured to or a part of the frame C of the lathe, said rod being provided with a bore b. (Indicated by dotted lines, Fig. II.) Upon the inner end of said spindle A is coaxially secured at driving-pulley D, upon the inner end of whose hub is rotatively secured a pinion e, forming one member of a train of differential gearing forming a speed-reducing device and hereinafter more fully described, the particular formof such gearing being, howover, well known. c

That part of the rod B adjacent to the portion journaling the driving-spindle is of reduced diameter, as shown in Fig. II, and upon such part is m'ounteda clutch F, consisting of two members f andf the one, f, being rotatively fixed to and the other, f, being loose and rotatable upon said rod, as will further appear. Secured to or formed upon the rotatable clutch member f is a second pinion e, forming a part of the difierential gearing above mentioned. J ournaled upon the outer cylindrical surfaces of said clutch members is a second driving-pulley D, coaxial with spindle A, said pulley being provided with two studs (1, upon each of which is journaled a double pinion e having two diameters, as

is shown in Fig. II, the portion of said pinion of larger diameter meshing with the pinion e and the portion of smaller diameter meshing with the pinion e. The two pulleys D and D are therefore connected with each other through the medium of differential gearing consisting of the pinions e e, and c Pulley D being secured upon the spindle A and pulley D being loosely rotatable upon the clutch, it is seen that when the two clutch members are disconnected pulley D may be caused to drive the spindle, pulley D at such time being an idler. The two clutch members when engaged permit the pulley D to be the driver, driving the pulleyD and its attached spindle through the medium of the diiferential gearing, and thereby forming a speed-reducing means, the speeds produced by the two pulleys being comparatively fast and slow. i

Clutch member f is provided with a keyway f in which slides a key 6, secured to the rod B, as is shown in Fig. II. Said rod is provided with an elongated opening 5 through which extends a pin g, secured to a shifting rod G, located in the bore 1) of the rod B, as

is shown in Fig. II. The inner end of said shifting rod is engaged bya helical spring b located in the bore of the rod B and confined therein by means of a screw-plug thereby tending to maintain the shifting rod G and clutch member fin the position shown in Fig. II, such position being that in which the two clutch members engage each other, as shown.

Adjacent to pulley D and secured to a second hollow spindle A, supported upon rod B, is a third pulley D rotatively independent of the adjacent pulleys D and D. hollow spindle A is secured or'formed a pinion a, which meshes with a second piniono,

Upon said the latter meshing with a third pinion a secured to the live spindle H, as show-n in Fig. I. Secured to or formed upon the drivingspindle A is a pinion a meshing with a gear 00, secured to said live-spindle H, as shown in said figure.

yond the end of the rod B, as shown in Fig.

II, such end being secured toalink B, whose opposite end is secured to a slidable rod J, mounted in a suitable bracket 0.

port j for a roller j, having its axis of rotation transverse with respect to the axis of rotation of the driving-spindles.

ther appear. I

A suitable belt-shifter L is located in the vicinity of the driving-pulleys, as shown in Fig. Land is connected with the lathe mechanism in a manner and is of a construction such that the belt may be shifted from pulley D to pulley D, thence to pulley D and then returned topulley D. Such belt-shifter may be of any desired construction, but is preferably of the construction shown and described in Letters Patent No. 554,813, dated February 18, 1896.

In operating theabove-described"device the belt is first placed upon the pulley D, the clutch members being so placed as to be dis- I engaged one from the other, whereby-the pul- The speed so ac% quired by the live-spindle His comparatively high and maybe utilized in operations upon; thework secured to the live-spindle, such as; a light superficial trimming out. When such operation is completed and it is desired to im- 5 part a'comparatively slow speed to the work, 1

ley D is rendered idle.

the cam-drum is so timed as to cause the cam is to engage the roller j, shift the position of the shifting rod G, and thereby efiect the engagement of the two clutch members, the

belt-shifter beingso timed as to shift the belt upon the pulley D simultaneously with the action of the cam drum described. The clutch memberf' thereby becomes rotatively fixed to the rod B and effects the operation of the differential gearing, transmitting the motion of pulley D to pulley D, and thereby imparting acomparatively slow speed to the live-spindle through the medium of the connecting gearing. The operation requiring the slow speed now being completed, the beltshifter is actuated so as to throw the belt upon the pulley D thereby reversing the movement of the live-spindle, as is required in the operation of cutting threads upon the workwhen it is desired to remove the dies from the threads upon completion of the thread-cutting operation, the speed so ac- Upon the end of said slidable rod .T is secured a supquired being a comparatively high one. Si multaneously with the shifting of the belt upon pulley D the shifting rod G is actuated by the cam is, so as to disengage the two clutch members, thereby permitting pulley D to become idle and the pulley D to be The end of the shifting rod G opposite that j engaged by the helical spring I) projects bedriven by the live-spindle.

The particular arrangement above described is especially adapted for use in cutting threads upon a blank, in which a light out is first taken, so as to trim or finish the surface of the blank, the dies then applied, the thread out, and the dies then withdrawn, the blank having its direction of rotation simultaneously reversed. The trimming or finishing operation permitting a much higher speed on the part of the blank than is permitted in the thread-cutting operation, it is seen that the capacity of the machine is increased over that which ithas when the speed of rotation of the live-spindle is uniform, such speed being necessarily that required in the thread-cutting operation and much slower than may be used for the trimming out.

The spring b is utilized for counteracting the tendency'of the rods G and J to jam or cramp when being shifted by cam 70, so as to cause the clutch members to engage, and is made of a size and degree of elasticity insuflicien't for shifting the parts by "its own force only.

"Other modes of applying the principle of my invention "may be employed instead of the one explained, change being made as regards the means herein disclosed, provided the means covered by any one of the following claims be employed.

- i therefore particularly point out and 'disti-nctly claim as my invention-- 1. In an automatic lathe, a head-stock speed-changing device comprising in its-cons'tructionthecombination of a driving=spin'- dle, driving-pulleys mounted so as to be coaxial with said spindle, two of such pulleys provided with connecting differential gear= ing, clutch mechanism, one member of such gearing being connected with one memberof saidclu-tch mechanism, and means for throwing said clutch member into and out of en-= gagemen-t with the other whereby said differ-- ential gearing may be rendered operative or inoperative.

2. In an automatic lathe, a head stock speed-changing device comprising in its con-' struction,the combination of a hollow spindle, two clutch membersmounted upon said spindle, oneof which is rotatively fixed and the other of which when disengaged from the first, is-capable of rotation on 'said spindle, two pulleys mounted upon the latterand connected with each other through the medium of differential gearing, one element of such gearingbein g secured to said rotatable clutch member, and means for connecting and disconnectingsaid clutch members, one pulley being fixed to and the other rotatable upon said spindle.

3. In an automatic lathe,a speed-changing device comprising in its construction a hol- ;1ow driving-spindle, two clutch members mounted upon said spindle one of which is rotatively fixed but longitudinally movable and the other of which when disengaged from a the first, is capable of rotation on said spindle,

:nected with each other through the medium of differential gearing, one element of such 1 gearing beingsecured to said rotatable clutch :member, a shifting rod in said spindle connected with said rotatively-fixed clutch mem- [,ber, and a rotatable cam-drum for engaging said rod, whereby the latter may be actuated to cause said clutch members to engage or disengage and the differential gearing rendered operative or inoperative.

4. In an automatic lathe, the combination of a live-spindle, a driving-spindle, three pul a leys mounted upon the latter, two of such pulleys connected with each other through .the medium of speed-reducingmeans, and

clutch mechanism for rendering such speed-' reducing a means operative or inoperative whereby one of such pulleys may be caused i a to drive said spindle direct or the other caused it t to drive the first through the medium of such a gearing, such driving-spindle connected with I two pulleys mounted upon the latter and con said live-spindle by gearing, the third pulley being independent of the remaining two pulleys and connected with the said spindle by gearing.

5. In an automatic lathe, the combination of a live-spindle, a driving-spindle, three pulleys mounted upon the latter, a belt and driving means for driving said three pulleys in the same direction, two of the latter connected with each other through the medium of speed-reducing means, and clutch mechanism for rendering such speed -red.ucing means operative or inoperative whereby one of such pulleys may be caused to drive said spindle direct or the other caused to drive the first through the medium of such gearing, such driving-spindle being connected with said live-spindle by gearing, the third pulley being independent of the remaining two and connected with said live-spindle by gearing having a number of elements such as to produce a rotation of said live-spindle opposite that produced by said remaining two pulleys;

Signed by me this 9th day of October, 1900;

J. P. BROPHY.

Attest.

GEO. WM. SAYWELL, A. E. MERKEL. 

